Journal
PHYSICAL REVIEW D
Volume 84, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.84.043526
Keywords
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Funding
- Japan Society for the Promotion of Science (JSPS) [PD: 22-181, 21740168]
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- Probing the Dark Energy through an Extremely Wide and Deep Survey with Subaru Telescope [467]
- Grants-in-Aid for Scientific Research [10J00181, 21740168] Funding Source: KAKEN
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We measure the halo power spectrum in redshift space from cosmological N-body simulations, and test the analytical models of redshift distortions particularly focusing on the scales of baryon acoustic oscillations. Remarkably, the measured halo power spectrum in redshift space exhibits a large-scale enhancement in amplitude relative to the real-space clustering, and the effect becomes significant for the massive or highly biased halo samples. These findings cannot be simply explained by the so-called streaming model frequently used in the literature. By contrast, a physically motivated perturbation theory model developed in the previous paper reproduces the halo power spectrum very well, and the model combining a simple linear scale-dependent bias can accurately characterize the clustering anisotropies of halos in two dimensions, i.e., line-of-sight and its perpendicular directions. The results highlight the significance of nonlinear coupling between density and velocity fields associated with two competing effects of redshift distortions, i.e., Kaiser and Finger-of-God effects, and a proper account of this effect would be important in accurately characterizing the baryon acoustic oscillations in two dimensions.
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